Unitary regulating and controlling means for drill feed mechanism



INVENTOR.

Patented May 17,

H. STAGE. UNITARY REGULATING AND CONTROLLING MEANS FOR DRILL FEED MECHANISM.

APPLICATION FILED MAR. 4,1920.

-in connection with the drilling.

snow I. sauce, or EASTON,

oomrm,

PENNSYLVANIA, ASSIGNOB TO INGEBSOLL-RLND OF JERSEY CITY, NEW JERSEY,

A CORPORATION 01 NEW JERSEY.

UNI'IL'BY BEGULATING AND CONTROLLING MEANS FOR DRILL FEED MECHANISM.

specification o! lietten ratent.

Patented May 17, 1921.

Application filed March 4, 1920. Serial No. 368,164.

To all whom it mag comma."

Be it known that I \HA om L-S'raon, a citizen of the United. States, residing at Easton, in the county of Northampton and State of Pennsylvanla, have invented a certain new and useful Improvement in nitary Regulatin and Controlling Means for Dl'lll Feed Mec anism, of which the followin is a specification.

, his invention relates to'fiuid actuated rcussive tools, but more particularly to fluid actuated feeding mechanism therefor, and the primary object of the invention is to procure a unitar regulating and controllin device whic may be mounted in operative relation to the feed mechanism for automatically regulating the pressure and for controlling the forward and reverse movement of the feeding mechanism. By

roviding a unitary construction containing th a pressure regulatin trollin throttle valve 0 osely adjacent to er in the same casing, both may be conveniently controlled and manipulated fromthe same location withone hand, leaving the other hand free for other purposes Another object of the invention is to afford sim 1e and efficient means which may be readiiy and 'uickly' controlled. for obtaining a uick orward and back motion of the fee mg mechanism without causing the -motive fluid to sure reducing regulating valve. Means are preferably provided for setting the regulatmg valve to control dliferent pressures and he mechanism is so devised and constructed sive tool embodyin that the reducing valve may be set as desired, and yet a powerful forward feed may be obtained whenever wanted without alter ingfhe setting of the reducing valve. 0 these and other ends which will hereinafterappear, the invention consists of the combinations of elements described and claimed in this specification and shown in the accompanying drawings in which- Figure 1 is a side elevation of a percus the invention, Fi 2 is an e ar ed longitudinal sectiona view partly roken away, 'taken through the air feed cylinder,

Fig. 3 is a transverse sectional VlBW. on the hne tion of the arrows. -.In F1 1, 2 and 3 the parts are in position for orward feed,

tudinally movable tu valve and a conto the casing B through the inlet pass through the pres-' toothed member 3-3 of Fig. 2 looking in the direc- Fig. 4 is a detail longitudinal sectional vlew partly broken away, valve casing and showing tion for reverse, and r Fig. 5 is a transverse sectional view partly broken away, taken throu h the valve casing on the line 5-5 of ig. 4 looking in the direction of the arrows.

Referring to the drawings, the cylinder and related parts of a percussive tool of suitable character for illustrating the apthe parts in posiplication of the invention, are shown 1n dotted lines mounted on the carriage A havmg a caslng B suitably secured to the longiular iston rod casing 0 of the stationary air eed cylinder D as by means of the bolts E. The carriage A mcludes the piping F and the bracket G slidably mounted on the rods or bolts H connecting the back head J and front head K of the feedcylinder D. The front cylinder head K, as sh0wn, is provided with a disk or pedestal L for mounting the tool on a suitable support. Motive fluid is supplied to the inlet 0 and passes to the percussive tool as indicated by the arrow P, and asses from thence to the air feed cylinder in the mannerto be described and under control of unitary controlling means forming the principal subject matter of this invention. The air feed cylinder and its operative parts may be constructed in any suitable manner, but I prefera construction substantially similar to that discussed in my U. Patent No. 1,336,930 dated April 13, 1920, for rock drill seating and controlling means,

taken through the as a simple and efiicient air feeding mechav nism, certain modifications in that mechanism beingprovided for the purpose of the resent invention; In the construction herein shown for illustrated purposes, a clamp{- ing1 ring Ris clamped by the front head an ring and asleeve T formin box for the piston rodcasin The hollow piston head driven forward in the cylinder the drill and retracted for the reversevmovement, is provided with a tubular piston rod V within the casipvg C. A tubular rack or is disposed within the hollow piston rod V .as shown and is su ported and held at'its rearward end by t e plate X. A pair of. spring pressed pawls a stuffing ada ted to be to feed Y pivoted to the piston head U are adapted to engage the notches Z on the sides of the rack W as the piston is advanced, thus preventing retrograde movement during the feed. For the reverse movement the piston head U and piston rod V. are turned through ajquarter revolution by turning the throttle valve a in the manner to be described so that the pawls Y are disengaged from the rack and the piston may slide rearwardly over the rack.

tapered throttle valve a is seated. A handle 6 is provided for turning the valve and a reduced portion on the valve in the form of a tongue 0 is set into theslotted forward end (I of the hollow piston rod vV so that by turning the valve a, the piston rod and piston U'are rotated to disengage the pawls from the rack for reversing purposes.

The forward end of the hollow piston rod V has a central-aperture'e communicating with the central passage 7 of the valve plug a through the bushing g forming a stufling box for admission of fluid through the piston rod V and the hollow rack W, and through the port It at the rear end .of the rack behind the piston head U to force the piston forward. On the forward feeding movement the fluid in front of the piston head] U passes through port 7' in the piston rod casing C- and through the space 76 between the casing C: and the piston rod V, and out through the ports 0 in the ring 72 to the port 9 in the valve 1 and exhausts to atmosphere through the exhaust port 1' in the casing B. For the reverse movement to retract the piston U the valve is turned to the position shown in Fig. 4 as will be explained, and fluid is admitted "from the valve through the ports 0 in the ring 12 to the space labe tween the casing C and piston rod V and through port. j in frontof the piston head U. The exhaust behind the, Piston head then asses through port h to the hollow rack and piston rod V and out through the central port 0 to the valve a and exhaust portfr in the casing 'B.

.One of the important features of this invention consists of the valve casing B and its associated and contained parts ,which form aunitary controlling and regulating means for the drill feeding mechanism. The casing B contains in addition to the throttle valve a the regulating valve, the parts of which are arranged in theivalve chambers 8 and t communicating with the valve chamber containing the valve a by means of the passages u and '0 respectively for the purposes.

The regulating or reducing valve between the fluid pressure supply inlet Q and the feed cylinder D is to maintain ,a constantly regulated pressure in the feed cylinder As shown, the casing 13 has a tapered port 1n whlch themit fluid to exhaust fluid to the air feed cylin within close limits. The pressure in the feed cylinder is "maintained substantially constant regardless of the work being done by the tool, and a regulating valve substantially likethat disclosed m my U.. S. Patent No. 1,361,636, dated Dec. 7, 1920,

for drill feeding means, may be used although I do not limit myself to any particular type of valve and only show the one referred to for purposes of illustration with suitable modifications for adapting the valve tothe present invention.

As shown, fluid pressure enters chamber 8 from inlet Q and may pass to chamber at around the fluted stem '10 of the valve :11 normally pressed toward its seat by the light spring y, or else pressure may pass directly through the passage u and thence to the feed-cylinder de ending upon the position of the valve a. plunger-z in the chamber at is normally pressed against the valve stem 10 by a sprlng 2 abutting against a nut 3 having flutes 4 which restramits rotation as the threaded bolt 5 is adjusted by the Wing nut 6 to adjust the tension of the spring 2.- The spring adjusting means may be inclosedwithln the screw cap 7 for convenience with which the flutes 4 of the nut 3 engages. As shown, a leak port 8 is provided, for the valve chamber t.

cause the plunger 2 to force the valve :14 to open a certain amount and permit i'essure to pass around the flutes of the va ve stem w to the chamber t. An increase of pressure beyond the critical pressurewill move the plunger 2 in the opposite direction and perthrough the ort 8. By means of the reducing valve, :0 an 7 associated parts as described, the supply of motive or is regulated and automatically maintained at an desired constant pressure loss than the fu line pressure. A

In the position of the. arts shown in Figs. 1, 2 and 3, the thrott e valve a is set for forward feed, the fluid pressure being regulated by the reducing valve as. The construction is such, however, that a uick forward and'back motion of the dri 1 may be obtained without taking the air through the reducing valve. The reducing, valve may be set as. desired and yet a powerful forward feed may be -obtained -whenever wanted without altering this setting and this is one of the features of the invention made read-L ily available in a simple and convenient manner b' the unitary construction provided. ith. the parts in the position shown in Figs. 1, 2 and 3, air passes to and through reducing valve w as indicated by the arrows, to chambert, and through passage 'v to the radial passage 9 in valve a, and through the central assage f in the valve to the feed cylinder to force the piston U forward as heretofore described. For the reverse movement as shown in Fig. 4:, the valve a is turned to bring the lengthened peripheral passage g in communication with the direct supply passage u from the valve chamber 8, and the radial passage 10 is brought opposite the exhaust port in the valve casing B. Air then enters through passage u and follows around the peripheral passage 9 and back through the longitudinal slot 11 to the ports 0 in the ring 12 and passes into the feed cylinder as heretofore described.

For quick forward movement, the valve a is turned to bring the radial passage 9 epposite the direct supply passage to, and the lengthened peripheral passage 9 remains in communication with the exhaust port 9" in the valve easing B, permitting exhaust from the feed cylinder D.

I claim:

1. In fluid actuated feeding mechanism for drills having forward and reverse movement, a unitary regulating and controlling device mounted in operative relation to the feeding mechanism and comprising a valve casing having a plurality of regulating valve chambers, one of which is supplied with motive fluid under line pressure, an automatic pressure reducing valve operating in said chambers, an adjacent throttle valve chamber in said valve easing communicating with both chambers of said re ulating valve, and a throttle valve in sald throttle valve chamber for controlling the forward and reverse action of-the feed v device mounted in operative relation to the feeding mechanism and comprising a valve casing having a plurality of regulating valve chambers one of which is supplied with motive fluid under line pressure, an

automatic pressure reducing valve-'operat- 7 ing in said chambers, means forsetting said valve to automatically control 7 d fferent pressures, an adjacent throttle valve diam-- her in said valve casing communicating with both chambers of said regulating valve, and a throttle valve in said throttle-valve chamber for controlling the forward and reverse action of the feed mechanism whereby'the feed mechanism maybe supplied with motive fluid under line pressure directly from one regulating valve chamber or with re duced pressure from the other regulating valve 0 amber withou't'altering the setting of the said regulating valve.

In testimony whereof, I have hereunto set my hand.

HAROLD 1. STAGE. 

